Lens



FIG. 1 is a perspective view of the front and side of a lens showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top view thereof, with the bottom, right side and left side being the same; and,

FIG. 5 is a cross-sectional view thereof, along 5—5 in FIG. 2. 

The ornamental design for a lens, as shown and described. 